If you've been out of the loop on TF2 for a while, you probably don't realize that it just got a huge update releasing competitive matchmaking. It's pretty simple; you can queue up for casual or competitive modes and the game will find you a match with other players. The casual mode still has random crits enabled, the absolute worst part of the game, but it's at least a step above community server games and there's no autobalance. Comp mode is full-on as level as possible for two teams of 6 players to compete. Both have leveling/progression mechanics, but you can lose mmr in comp vs casual is a simple leveling system. They're pretty buggy right now, but functional. Give it a try.